Artificial tooth and anchor.



Patentod Dec. 30,1902, s. 8. 81.00". ARTIFICIAL TOOTH AND ANCHOR.

(Application filed Nov. 9, 1901 (No Model.)

R /JTNEEEES:

UNlTE STATES PATENT OFFICE.

SAMUEL S. BLOOM, OF PHILADELPHIA, PENNSYLVANIA.

ARTIFICIAL TOOTH AND ANCHOR.

QPECIFICATION forming part of Letters Patent No. 717,158, dated December30, 1902.

Application filed November 9, 1901. Serial No. 81.748. (No model.)

To to whom it may concern:

Be it known that I, SAMUEL S. BLooM, of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented new and usefulImprovements in Artificial Teeth and Anchors Therefor; and I do herebydeclare the following to be a full, clear, and exact description of saidinvention, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

One of the means for connecting artificial teeth with the plate orsupport therefor involves the use ofpins the anchorage of which isinserted in the tooth before baking. As most metals fuse under thetemperature required to bake the porcelain of which the teeth are made,platinu m is usually employed. Sometimes the pins are integral with theanchorage and are made entirely of platinum; but as this metal isexpensive attempts have been made to make the anchors only of platinumand to secure pins of German silver and other metal cheaper thanplatinum to said anchors. Diificulty has been experienced in obtaining afirm and durable union between the silver pins and the platinum anchors,and difliculty has also been experienced in properly locating theanchors in the molds in which the teeth are baked.

The object of this invention is to provide an improved anchor which canbe given its proper location by means of the old and wellknown form ofmold in which holes are formed for the reception of pins, said anchoraffording means for a perfect soldered connection with the pins ofGerman silver or other suitable metal and for steadying and protectingsaid pins. This object is accomplished by causing the anchor-tube toproject beyond the tooth-body to afford a more secure bearing for thepin that is to be soldered therein.

To these ends the invention consists in the anchors and in theconnection therewith of pins, substantially as hereinafter described andclaimed.

In the drawings, Figure 1 represents a section of a tooth greatlyenlarged and showing one form of the platinum anchor embedded therein.Fig. 2 represents a similar view showing a pin in the position which itoccupies when secured to the anchor and the tooth.

Fig. 3 represents adetail section of the anchor shown in Figs. 1 and 2.Figs. 4 and 5 represent, respectively, an enlarged section and aperspective view of modified forms of anchors.

Similar reference characters indicate the same parts throughout theseveral views.

One form of artificial tooth is represented at a, and what is commonlyknown as the pin-flange thereof is represented at b.

The platinum anchor is represented at c, and d representsa pin having ahead d,which pin is secured in the anchor by solder, the head of saidpin being adapted to be embedded in the plate to which the tooth isattached. The anchor consists of a flaring or tapering shell of metal,such as platinum, which is fusible only at a temperature higher thanthat required to bake the material of which the tooth is made. As shownin Figs. 1, 2, and 3, the anchor is formed of a hollow shell, which isflared or tapered slightly and uniformly from. end to end. Asrepresented in Fig. 4:, the flaring or tapered shell may be shorter thanrepresented in the other figures, and in this case it is formed with anextension 0, the walls of which are parallel. The anchor represented inFig. 5 is similarin shape to that shown in Fig. 3; but it is cut away orformed with an open space along one side in order to save metal.

In using any one of the forms of anchor shown in the drawings theanchors are or may be placedin the molds with the smallends resting inthe holes provided in such molds for the ordinary purpose of holdingpins. The larger ends of the anchors project into the cavities of themolds which are filled with tooth material. The anchors are thenpreferably filled with wax or other suitable material which will preventthe tooth material from entering the anchors. The cavities of the moldsare filled and the teeth are baked in the usual manner. During thebaking operation the wax, if such is employed, will be burned out,leaving the space inside of the anchors ready toreceive the pins, aspresently described. After the teeth are baked and are removed ordelivered from the molds in the ordinary way a small amount of soldermay be inserted in the anchors and the pins d pushed therein, asrepresented in Fig. 2. Owing to the flared or larger inner ends of theanchors, sufficient space is left around the inner ends of the pins tofirmly hold said pins Without exuding from the anchors. The smaller endsof the anchors project from the pin-flange substantially as represented.This steadies and strengthens the pin, and when said anchors project farenough practically the entire stem of the pin will be covered with theplatinum, and hence there is less liability of the silver of the pin orthe silver solder which is employed causing the rubber plate to becomespongy around the pin.

Having thus described my invention, What I claimas new is '1. Anartificial tooth having an internally flaring or tapering shell of metalembedded SAMUEL S. BLOOM.

Witnesses:

JAMES G. ATTRIDGE, STEPHEN K. CLIFTON.

